/*
 * The MIT License
 *
 * Copyright 2015 CloudBees, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.jenkinsci.plugins.gitclient;

import hudson.Launcher;
import hudson.model.TaskListener;
import hudson.util.StreamTaskListener;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import jenkins.scm.impl.mock.AbstractSampleDVCSRepoRule;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.RepositoryBuilder;
import org.htmlunit.WebResponse;
import org.htmlunit.util.NameValuePair;
import org.jvnet.hudson.test.JenkinsRule;

/**
 * Manages a sample Git repository.
 */
public final class GitClientSampleRepoRule extends AbstractSampleDVCSRepoRule {

    private static final Logger LOGGER = Logger.getLogger(GitClientSampleRepoRule.class.getName());

    public void git(String... cmds) throws Exception {
        run("git", cmds);
    }

    @Override
    public void init() throws Exception {
        run(true, tmp.getRoot(), "git", "version");
        git("init");
        write("file", "");
        git("add", "file");
        git("config", "--local", "user.name", "Git SampleRepoRule");
        git("config", "--local", "user.email", "gits@mplereporule");
        git("commit", "--message=init");
    }

    public boolean mkdirs(String rel) {
        return new File(this.sampleRepo, rel).mkdirs();
    }

    public void notifyCommit(JenkinsRule r) throws Exception {
        synchronousPolling(r);
        WebResponse webResponse = r.createWebClient()
                .goTo("git/notifyCommit?url=" + bareUrl(), "text/plain")
                .getWebResponse();
        LOGGER.log(Level.FINE, webResponse.getContentAsString());
        for (NameValuePair pair : webResponse.getResponseHeaders()) {
            if (pair.getName().equals("Triggered")) {
                LOGGER.log(Level.FINE, "Triggered: " + pair.getValue());
            }
        }
        r.waitUntilNoActivity();
    }

    public String head() throws Exception {
        return new RepositoryBuilder()
                .setWorkTree(sampleRepo)
                .build()
                .resolve(Constants.HEAD)
                .name();
    }

    public File getRoot() {
        return this.sampleRepo;
    }

    public boolean gitVersionAtLeast(int neededMajor, int neededMinor) {
        return gitVersionAtLeast(neededMajor, neededMinor, 0);
    }

    public boolean gitVersionAtLeast(int neededMajor, int neededMinor, int neededPatch) {
        final TaskListener procListener = StreamTaskListener.fromStderr();
        final ByteArrayOutputStream out = new ByteArrayOutputStream();
        try {
            int returnCode = new Launcher.LocalLauncher(procListener)
                    .launch()
                    .cmds("git", "--version")
                    .stdout(out)
                    .join();
            if (returnCode != 0) {
                LOGGER.log(Level.WARNING, "Command 'git --version' returned " + returnCode);
            }
        } catch (IOException | InterruptedException ex) {
            LOGGER.log(Level.WARNING, "Exception checking git version " + ex);
        }
        final String versionOutput = out.toString().trim();
        final String[] fields = versionOutput
                .split(" ")[2]
                .replaceAll("msysgit.", "")
                .replaceAll("windows.", "")
                .split("\\.");
        final int gitMajor = Integer.parseInt(fields[0]);
        final int gitMinor = Integer.parseInt(fields[1]);
        final int gitPatch = Integer.parseInt(fields[2]);
        if (gitMajor < 1 || gitMajor > 3) {
            LOGGER.log(
                    Level.WARNING,
                    "Unexpected git major version " + gitMajor + " parsed from '" + versionOutput + "', field:'"
                            + fields[0] + "'");
        }
        if (gitMinor < 0 || gitMinor > 50) {
            LOGGER.log(
                    Level.WARNING,
                    "Unexpected git minor version " + gitMinor + " parsed from '" + versionOutput + "', field:'"
                            + fields[1] + "'");
        }
        if (gitPatch < 0 || gitPatch > 20) {
            LOGGER.log(
                    Level.WARNING,
                    "Unexpected git patch version " + gitPatch + " parsed from '" + versionOutput + "', field:'"
                            + fields[2] + "'");
        }

        return gitMajor > neededMajor
                || (gitMajor == neededMajor && gitMinor > neededMinor)
                || (gitMajor == neededMajor && gitMinor == neededMinor && gitPatch >= neededPatch);
    }
}
